Built-in antenna device for portable wireless terminal

Abstract

A built-in antenna device for improving the radiation efficiency in a portable wireless terminal having an external metallic part is provided. The built-in antenna device includes a main board, an antenna radiator, and a conductor. The main board has a feed pad for supplying an electrical signal and a ground pad connected to ground. The antenna radiator is connected electrically to the feed pad and the ground pad of the main board to radiate a signal. The conductor connects the metallic part and the ground pad of the main board. The metallic part and the ground pad of the main board are at the same ground potential.

1 . A built-in antenna device for a portable wireless terminal having a metallic part, the device comprising:
 a main board having a feed pad for supplying an electrical signal and a ground pad connected to ground;   an antenna radiator connected electrically to the feed pad and the ground pad for radiating a signal; and   a conductor electrically connecting the metallic part and the ground pad of the main board,   wherein the metallic part and the ground pad of the main board are at the same ground potential.   
   
   
       2 . The device of  claim 1 , wherein the conductor includes at least one of a session cable, a conductive tape, and a conductive sponge. 
   
   
       3 . The device of  claim 1 , wherein the conductor includes at least one of a metallic rod, a metallic screw, and a pin that electrically connects the metallic part and the ground pad of the main board and fixes the metallic part and the ground pad of the main board at regular intervals. 
   
   
       4 . The device of  claim 1 , wherein the main board includes a via connected to the ground pad, and the ground pad and the metallic part are electrically connected through the via. 
   
   
       5 . The device of  claim 1 , wherein the metallic part comprises an outer surface of the portable wireless terminal. 
   
   
       6 . The device of  claim 5 , wherein the metallic part comprises a plurality of metallic parts located on opposite sides of the portable wireless terminal. 
   
   
       7 . The device of  claim 6 , wherein the plurality of metallic parts are electrically connected to be at the same ground potential. 
   
   
       8 . The device of  claim 7 , wherein the plurality of metallic parts are electrically connected at the same ground potential by the conductor. 
   
   
       9 . A built-in antenna device for a portable wireless terminal having a metallic part, the device comprising:
 a main board including a feed pad for supplying an electrical signal and a ground pad connected to ground;   an antenna radiator connected electrically to the feed pad of the main board for radiating a signal;   at least one first connector electrically connecting the ground pad and the metallic part; and   a second connector electrically connecting the antenna radiator and the metallic part,   wherein the metallic part and the ground pad of the main board are at the same ground potential.   
   
   
       10 . The device of  claim 9 , wherein each of the first connector and the second connector includes at least one of a session cable, a conductive tape, a conductive sponge, and a metallic plate. 
   
   
       11 . The device of  claim 9 , wherein the second connector includes at least one of an elastic spring, a metallic rod, a metallic screw, and a pin that electrically connects the antenna radiator and the metallic part and fixes the antenna radiator and the metallic part at regular intervals. 
   
   
       12 . The device of  claim 9 , wherein the first connector includes at least one of an elastic spring, a metallic rod, a metallic screw, and a pin that electrically connects the metallic part and the ground pad of the main board and fixes the metallic part and the ground pad of the main board at regular intervals. 
   
   
       13 . The device of  claim 9 , wherein the main board includes a via connected to the ground pad, and the first connector is electrically connected to the via. 
   
   
       14 . The device of  claim 9 , wherein the metallic part comprises an outer surface of the portable wireless terminal. 
   
   
       15 . The device of  claim 9 , wherein the metallic part comprises a plurality of metallic parts located on opposite sides of the portable wireless terminal. 
   
   
       16 . The device of  claim 15 , wherein the plurality of metallic parts are electrically connected to be at the same ground potential. 
   
   
       17 . The device of  claim 16 , wherein the plurality of metallic parts are electrically connected at the same ground potential by at least one of the first connector and the second connector.